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Moon Exposure Calculator (Looney 11)

Exposure · free · runs in your browser

The moon is a sunlit rock, so it needs daylight exposure: at f/11 the shutter speed is about 1 ÷ ISO for a full moon — the 'Looney 11' rule. Thinner phases are dimmer, so they need more exposure.

Pick your ISO, aperture and the phase to get a starting shutter speed, then check the histogram.

Shutter speed
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How it works

t = (1/ISO) × (N ÷ 11)² × 2^phase-stops (full 0, gibbous +1, quarter +2, crescent +3).

FAQ

Why is my moon a white blob?
Your camera metered the dark sky. Switch to manual and use this exposure.
Can I capture moon and landscape together?
Only near moonrise/moonset during twilight, when the sky and land are brighter — otherwise blend two exposures.

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